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海因里希对5000多起伤害事故案例进行了详细调查研究后得出海因里希法则，事故后果为严重伤害、轻微伤害和无伤害的事故件数之比为（）。
A . A、1：29：300
B . B、1：10：300
C . C、1：10：100
D . D、1：100：500
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